Re: [PATCH 13/15] drm/i915: Clean up CHV lane soft reset programming

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On Wed, Jul 08, 2015 at 11:45:59PM +0300, ville.syrjala@xxxxxxxxxxxxxxx wrote:
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> 
> Currently we relesar the lane soft reset before lane stagger settings
               release

> have been programmed. I believe that means we don't actually do lane
> staggering. So move the soft reset deassert to happen after lane
> staggering has been programmed.
> 
> The one confusing thing in this is that when we remove the power down
> override from the lanes, they power up with defaul register values,
> which do not have the soft reset overrides enabled. And according to
> some docs by default the data lane resets are tied to cmnreset. So that
> would mean that lanes would come out of reset without staggering as
> soon as the power down overrides are removed. But sine we can't access
> either the lane stagger register nor the soft reset override registers
> until the lanes are powered on, we can really do anything about it.
                                     can't?

> So let's just set the soft reset overrides as soon as the lane is
> powered on and hope for the best.

Fun story in these patches ...
-Daniel

> 
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/intel_dp.c   | 91 +++++++++++++++++++++------------------
>  drivers/gpu/drm/i915/intel_hdmi.c | 91 ++++++++++++++++++++++-----------------
>  2 files changed, 100 insertions(+), 82 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 817df87..297bd14 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -2389,42 +2389,62 @@ static void vlv_post_disable_dp(struct intel_encoder *encoder)
>  	intel_dp_link_down(intel_dp);
>  }
>  
> -static void chv_post_disable_dp(struct intel_encoder *encoder)
> +static void chv_data_lane_soft_reset(struct intel_encoder *encoder,
> +				     bool reset)
>  {
> -	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> -	struct intel_digital_port *dport = dp_to_dig_port(intel_dp);
> -	struct drm_device *dev = encoder->base.dev;
> -	struct drm_i915_private *dev_priv = dev->dev_private;
> -	struct intel_crtc *intel_crtc =
> -		to_intel_crtc(encoder->base.crtc);
> -	enum dpio_channel ch = vlv_dport_to_channel(dport);
> -	enum pipe pipe = intel_crtc->pipe;
> -	u32 val;
> +	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> +	enum dpio_channel ch = vlv_dport_to_channel(enc_to_dig_port(&encoder->base));
> +	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
> +	enum pipe pipe = crtc->pipe;
> +	uint32_t val;
>  
> -	intel_dp_link_down(intel_dp);
> +	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW0(ch));
> +	if (reset)
> +		val &= ~(DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
> +	else
> +		val |= DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET;
> +	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW0(ch), val);
>  
> -	mutex_lock(&dev_priv->sb_lock);
> +	if (crtc->config->lane_count > 2) {
> +		val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW0(ch));
> +		if (reset)
> +			val &= ~(DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
> +		else
> +			val |= DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET;
> +		vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW0(ch), val);
> +	}
>  
> -	/* Propagate soft reset to data lane reset */
>  	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW1(ch));
>  	val |= CHV_PCS_REQ_SOFTRESET_EN;
> +	if (reset)
> +		val &= ~DPIO_PCS_CLK_SOFT_RESET;
> +	else
> +		val |= DPIO_PCS_CLK_SOFT_RESET;
>  	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW1(ch), val);
>  
> -	if (intel_crtc->config->lane_count > 2) {
> +	if (crtc->config->lane_count > 2) {
>  		val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW1(ch));
>  		val |= CHV_PCS_REQ_SOFTRESET_EN;
> +		if (reset)
> +			val &= ~DPIO_PCS_CLK_SOFT_RESET;
> +		else
> +			val |= DPIO_PCS_CLK_SOFT_RESET;
>  		vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW1(ch), val);
>  	}
> +}
>  
> -	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW0(ch));
> -	val &= ~(DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
> -	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW0(ch), val);
> +static void chv_post_disable_dp(struct intel_encoder *encoder)
> +{
> +	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> +	struct drm_device *dev = encoder->base.dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
>  
> -	if (intel_crtc->config->lane_count > 2) {
> -		val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW0(ch));
> -		val &= ~(DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
> -		vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW0(ch), val);
> -	}
> +	intel_dp_link_down(intel_dp);
> +
> +	mutex_lock(&dev_priv->sb_lock);
> +
> +	/* Assert data lane reset */
> +	chv_data_lane_soft_reset(encoder, true);
>  
>  	mutex_unlock(&dev_priv->sb_lock);
>  }
> @@ -2802,27 +2822,6 @@ static void chv_pre_enable_dp(struct intel_encoder *encoder)
>  		vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW11(ch), val);
>  	}
>  
> -	/* Deassert soft data lane reset*/
> -	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW1(ch));
> -	val |= CHV_PCS_REQ_SOFTRESET_EN;
> -	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW1(ch), val);
> -
> -	if (intel_crtc->config->lane_count > 2) {
> -		val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW1(ch));
> -		val |= CHV_PCS_REQ_SOFTRESET_EN;
> -		vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW1(ch), val);
> -	}
> -
> -	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW0(ch));
> -	val |= (DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
> -	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW0(ch), val);
> -
> -	if (intel_crtc->config->lane_count > 2) {
> -		val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW0(ch));
> -		val |= (DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
> -		vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW0(ch), val);
> -	}
> -
>  	/* Program Tx lane latency optimal setting*/
>  	for (i = 0; i < intel_crtc->config->lane_count; i++) {
>  		/* Set the upar bit */
> @@ -2872,6 +2871,9 @@ static void chv_pre_enable_dp(struct intel_encoder *encoder)
>  			       DPIO_TX2_STAGGER_MULT(5));
>  	}
>  
> +	/* Deassert data lane reset */
> +	chv_data_lane_soft_reset(encoder, false);
> +
>  	mutex_unlock(&dev_priv->sb_lock);
>  
>  	intel_enable_dp(encoder);
> @@ -2910,6 +2912,9 @@ static void chv_dp_pre_pll_enable(struct intel_encoder *encoder)
>  
>  	mutex_lock(&dev_priv->sb_lock);
>  
> +	/* Assert data lane reset */
> +	chv_data_lane_soft_reset(encoder, true);
> +
>  	/* program left/right clock distribution */
>  	if (pipe != PIPE_B) {
>  		val = vlv_dpio_read(dev_priv, pipe, _CHV_CMN_DW5_CH0);
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> index 4b604ee..176d681 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -1612,6 +1612,50 @@ static void vlv_hdmi_pre_pll_enable(struct intel_encoder *encoder)
>  	mutex_unlock(&dev_priv->sb_lock);
>  }
>  
> +static void chv_data_lane_soft_reset(struct intel_encoder *encoder,
> +				     bool reset)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> +	enum dpio_channel ch = vlv_dport_to_channel(enc_to_dig_port(&encoder->base));
> +	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
> +	enum pipe pipe = crtc->pipe;
> +	uint32_t val;
> +
> +	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW0(ch));
> +	if (reset)
> +		val &= ~(DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
> +	else
> +		val |= DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET;
> +	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW0(ch), val);
> +
> +	if (crtc->config->lane_count > 2) {
> +		val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW0(ch));
> +		if (reset)
> +			val &= ~(DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
> +		else
> +			val |= DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET;
> +		vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW0(ch), val);
> +	}
> +
> +	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW1(ch));
> +	val |= CHV_PCS_REQ_SOFTRESET_EN;
> +	if (reset)
> +		val &= ~DPIO_PCS_CLK_SOFT_RESET;
> +	else
> +		val |= DPIO_PCS_CLK_SOFT_RESET;
> +	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW1(ch), val);
> +
> +	if (crtc->config->lane_count > 2) {
> +		val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW1(ch));
> +		val |= CHV_PCS_REQ_SOFTRESET_EN;
> +		if (reset)
> +			val &= ~DPIO_PCS_CLK_SOFT_RESET;
> +		else
> +			val |= DPIO_PCS_CLK_SOFT_RESET;
> +		vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW1(ch), val);
> +	}
> +}
> +
>  static void chv_hdmi_pre_pll_enable(struct intel_encoder *encoder)
>  {
>  	struct intel_digital_port *dport = enc_to_dig_port(&encoder->base);
> @@ -1637,6 +1681,9 @@ static void chv_hdmi_pre_pll_enable(struct intel_encoder *encoder)
>  
>  	mutex_lock(&dev_priv->sb_lock);
>  
> +	/* Assert data lane reset */
> +	chv_data_lane_soft_reset(encoder, true);
> +
>  	/* program left/right clock distribution */
>  	if (pipe != PIPE_B) {
>  		val = vlv_dpio_read(dev_priv, pipe, _CHV_CMN_DW5_CH0);
> @@ -1739,33 +1786,13 @@ static void vlv_hdmi_post_disable(struct intel_encoder *encoder)
>  
>  static void chv_hdmi_post_disable(struct intel_encoder *encoder)
>  {
> -	struct intel_digital_port *dport = enc_to_dig_port(&encoder->base);
>  	struct drm_device *dev = encoder->base.dev;
>  	struct drm_i915_private *dev_priv = dev->dev_private;
> -	struct intel_crtc *intel_crtc =
> -		to_intel_crtc(encoder->base.crtc);
> -	enum dpio_channel ch = vlv_dport_to_channel(dport);
> -	enum pipe pipe = intel_crtc->pipe;
> -	u32 val;
>  
>  	mutex_lock(&dev_priv->sb_lock);
>  
> -	/* Propagate soft reset to data lane reset */
> -	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW1(ch));
> -	val |= CHV_PCS_REQ_SOFTRESET_EN;
> -	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW1(ch), val);
> -
> -	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW1(ch));
> -	val |= CHV_PCS_REQ_SOFTRESET_EN;
> -	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW1(ch), val);
> -
> -	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW0(ch));
> -	val &= ~(DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
> -	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW0(ch), val);
> -
> -	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW0(ch));
> -	val &= ~(DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
> -	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW0(ch), val);
> +	/* Assert data lane reset */
> +	chv_data_lane_soft_reset(encoder, true);
>  
>  	mutex_unlock(&dev_priv->sb_lock);
>  }
> @@ -1796,23 +1823,6 @@ static void chv_hdmi_pre_enable(struct intel_encoder *encoder)
>  	val &= ~DPIO_LANEDESKEW_STRAP_OVRD;
>  	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW11(ch), val);
>  
> -	/* Deassert soft data lane reset*/
> -	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW1(ch));
> -	val |= CHV_PCS_REQ_SOFTRESET_EN;
> -	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW1(ch), val);
> -
> -	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW1(ch));
> -	val |= CHV_PCS_REQ_SOFTRESET_EN;
> -	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW1(ch), val);
> -
> -	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW0(ch));
> -	val |= (DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
> -	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW0(ch), val);
> -
> -	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW0(ch));
> -	val |= (DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
> -	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW0(ch), val);
> -
>  	/* Program Tx latency optimal setting */
>  	for (i = 0; i < 4; i++) {
>  		/* Set the upar bit */
> @@ -1855,6 +1865,9 @@ static void chv_hdmi_pre_enable(struct intel_encoder *encoder)
>  		       DPIO_TX1_STAGGER_MULT(7) |
>  		       DPIO_TX2_STAGGER_MULT(5));
>  
> +	/* Deassert data lane reset */
> +	chv_data_lane_soft_reset(encoder, false);
> +
>  	/* Clear calc init */
>  	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW10(ch));
>  	val &= ~(DPIO_PCS_SWING_CALC_TX0_TX2 | DPIO_PCS_SWING_CALC_TX1_TX3);
> -- 
> 2.3.6
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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